Fre points

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?